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/*
* Copyright 2014 - 2018 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.protocol;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import org.traccar.BaseFrameDecoder;
import java.nio.charset.StandardCharsets;
public class Pt502FrameDecoder extends BaseFrameDecoder {
private static final int BINARY_HEADER = 5;
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.readableBytes() < 10) {
return null;
}
if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf
&& buf.toString(buf.readerIndex() + BINARY_HEADER, 4, StandardCharsets.US_ASCII).equals("$PHD")) {
int length = buf.getUnsignedShortLE(buf.readerIndex() + 3);
if (buf.readableBytes() >= length) {
buf.skipBytes(BINARY_HEADER);
ByteBuf result = buf.readBytes(length - BINARY_HEADER - 2);
buf.skipBytes(2); // line break
return result;
}
} else {
if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf) {
buf.skipBytes(BINARY_HEADER);
}
int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\r');
if (index < 0) {
index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\n');
}
if (index > 0) {
ByteBuf result = buf.readBytes(index - buf.readerIndex());
while (buf.isReadable()
&& (buf.getByte(buf.readerIndex()) == '\r' || buf.getByte(buf.readerIndex()) == '\n')) {
buf.skipBytes(1);
}
return result;
}
}
return null;
}
}
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